Mask

ABSTRACT

A mask includes a body, a length adjustment member and a self-adaptive member. The body has an upper edge. The length adjustment member and the self-adaptive member are provided at the upper edge of the body. The self-adaptive member is provided at an inner side of the length adjustment member. The length adjustment member is bendable along a curve of a face and is able to act on the self-adaptive member, such that the self-adaptive member is deformed by force and adapted to the curve of the face to fit on the face.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a national phase entry under 35 USC § 371 of International Application PCT/CN2020/142452, filed Dec. 31, 2020, which claims priority to and benefits of Chinese Patent Application Serial No. 202010968175.7 filed Sep. 15, 2020 and Chinese Patent Application Serial No. 202010996637.6 filed Sep. 21, 2020, the entire contents of which are incorporated herein by reference.

FIELD

Embodiments of the present disclosure relates to a field of medical and health technology, and more particularly to a mask.

BACKGROUND

Masks are a kind of sanitary protective equipment for reducing or preventing harmful particles in the air such as germs, viruses, suspended particles, harmful gases and so on from being inhaled into the lungs, to ensure that wearers inhale pure air to a certain extent, and are widely used in fields of labor protection and health care. Especially in some highly polluted environments, masks have become a necessary protective tool.

In order to ensure that the mask has a good protective effect, the mask needs to fit well with the face, otherwise harmful gases will easily enter internal breathing space from a gap between the mask and the face, especially from both sides of the nose bridge. In the related art, the mask defines a recess or is provided with a strip at a position of the mask corresponding to the nose bridge. However, the fit between the mask with the recess form and the nose bridge is poor; and for the mask with strip form, the strip is prone to loose and deform when the user exhales. That is, the protection performance of the above two structures cannot be guaranteed.

SUMMARY

A mask according to embodiments of the present disclosure includes a body, a length adjustment member and a self-adaptive member. The body has an upper edge. The length adjustment member and the self-adaptive member are provided at the upper edge of the body. The self-adaptive member is provided at an inner side of the length adjustment member. The length adjustment member is bendable along a curve of a face and is able to act on the self-adaptive member, such that the self-adaptive member is deformed by force and adapted to the curve of the face to fit on the face.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a mask according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a self-adaptive member in a first position according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a self-adaptive member in a second position according to an embodiment of the present disclosure;

FIG. 4 is a front view of a mask according to an embodiment of the present disclosure;

FIG. 5 is an exemplary schematic view of a deformable sheet according to an embodiment of the present disclosure;

FIG. 6 is another exemplary schematic view of a deformable sheet according to an embodiment of the present disclosure; and

FIG. 7 is yet another exemplary schematic view of a deformable sheet according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detail below, and examples of embodiments are shown in drawings. Embodiments described with reference to drawings are explanatory, illustrative, and used to explain the present invention, but shall not be construed to limit the present disclosure.

As illustrated in FIG. 1 , a mask according to embodiments of the present disclosure includes a body 1 having an upper edge and a lower edge. The upper edge is provided with a length adjustment member 2 and an self-adaptive member 3 arranged at an inner side of the length adjustment member 3. The length adjustment member can be bent along a curve of a face and act on the self-adaptive member, such that the self-adaptive member is deformed by force and adapted to the curve of the face to fit on the face. The self-adaptive member is incurved towards the face to fit a structure of the face, achieving a sealing of the upper edge of the mask.

For the mask according to embodiments of the present disclosure, a deformation of the self-adaptive member 3 can be adjusted adaptively according to the bending magnitude of the length adjustment member 2, such that a shape of the upper edge of the body 1 is matched with a shape of the user's face, the mask fits more snugly on the face, the protective effect of the mask can be improved effectively.

In at least one embodiment, the self-adaptive member 3 includes a first self-adaptive fixing region 31, a second self-adaptive fixing region 32 and a self-adaptive region 33 located between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32. A position of the self-adaptive region 33 is arranged according to specific situation. After the user wears the mask, the self-adaptive fixing regions should be located near the periphery of cheekbone, preferably in a slightly inner side area of cheekbone. A distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32 can be adjusted by adjusting the length adjustment member 2, such that the self-adaptive region 33 is deformed to form an arc shape suitable for the face.

When the user wears the mask, the length adjustment member 3 generates a bending deformation suitable for the structure of the face, and the bending deformation of the length adjustment member 2 applies a pressure towards the face to the self-adaptive member 3, such that the self-adaptive member 3 can be deformed, and the self-adaptive region 33 forms an arc shape suitable for the face.

In some embodiments, the self-adaptive region 33 can be bent to change between a first position and a second position. The first position refers to a position of the self-adaptive region 33 when the mask is not worn by the user, and the second position refers to a position of the self-adaptive region 33 after the user wears the mask.

As illustrated in FIG. 2 , when the self-adaptive region 33 is in the first position, the self-adaptive member is in a flat and straight state, the self-adaptive region 33 is also in a flat and straight state, and the whole body 1 is in a flat state, which occupies a small space. As illustrated in FIG. 3 , when the self-adaptive region 33 is in the second position, the length adjustment member 2 drives the upper edge of body 1 to bend, a linear distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32 is reduced, and thus the self-adaptive region 33 is bent. The self-adaptive region 33 is substantially W-shaped and includes a first arc-shaped segment 331, a second arc-shaped segment 332 and an arc-shaped connecting portion 333. The arc-shaped connecting portion 333 is located between the first arc-shaped segment 331 and the second arc-shaped segment 332 and functions as a connection. The first arc-shaped segment 331 and the second arc-shaped segment 332 both protrude towards an inner side of the body 1, and the arc-shaped connecting portion 333 protrudes towards an outer side of the body 1. It should be noted that the outer side refers to a side of the body 1 away from the face when the user wears the mask, and the inner side refers to a side of the body 1 that fits the face.

When the self-adaptive region 33 is in the second position, the arc-shaped connecting portion 333 corresponds to a position of the nose bridge of the face, and the first arc-shaped segment 331 and the second arc-shaped segment 332 correspond to positions of the face at both sides of the nose bridge. The bending magnitude of the first arc-shaped segment 331, the second arc-shaped segment 332 and the arc-shaped connecting portion 333 can be adjusted adaptively according to the bending magnitude of the length adjustment member 2 or the distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32. The distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32 can be adjusted by tightening the length adjustment member 2, or by helical teeth, buckle latch, glue, friction, etc. Of course, the self-adaptive region 33 can also be in the second position in an initial state, and a snug fit between the self-adaptive region and the face can be achieved by fine-tuning the length adjustment member 2. In other words, the self-adaptive region 33 of the mask has been set to be W-shaped when it leaves the factory, and only by fine-tuning, the self-adaptive region 33 can adaptively fit the face snugly.

The greater the bending magnitude of the length adjustment member 2 or the closer the distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32, the greater the bending magnitude of the self-adaptive member 3 is. Users with different face shapes and nose shapes can adjust the bending magnitude of the adjusting belt or the distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32, to adapt the upper edge of the body 1 to their own face shape and nose shape. For example, for the user with a higher nose bridge, the bending magnitude of the length adjustment member 2 should be appropriately increased or the distance between the first self-adaptive fixing region 31 and the second self-adaptive region 32 should be appropriately reduced, such that the bending magnitude of the first arc-shaped segment 331, the second arc-shaped segment 332 and the arc-shaped connecting portion 333 become larger, and the shape of the upper edge of the body 1 is matched with the user's nose shape.

In some embodiments, a thickness of the self-adaptive region 33 is less than a thickness of the first self-adaptive fixing region 31, and a thickness of the self-adaptive region 33 is less than a thickness of the second self-adaptive fixing region 32. Therefore, the stress of the self-adaptive region 33 is weaker relative to the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32, and the self-adaptive region can be more easily deformed and have a better fit with the face.

In at least one embodiment, the thickness of the first arc-shaped segment 331 gradually increases from a middle to both sides of the first arc-shaped segment 331, the thickness of the second arc-shaped segment 332 gradually increases from a middle to both sides of the second arc-shaped segment 332, and the thickness of the arc-shaped connecting segment 333 gradually increases from a middle to both sides of the arc-shaped connecting portion 333.

In some embodiments, a width of the self-adaptive region 33 is less than a width of the first self-adaptive fixing region 31, and the width of the self-adaptive region 33 is less than a width of the second self-adaptive fixing region 32. The smaller the width, the weaker the stress is, resulting in an easier deformation. The above-described width direction is consistent with a width direction of the body 1 (an up-down direction shown by arrow B in FIG. 4 ).

In at least one embodiment, the width of the first arc-shaped segment 331 gradually increases from a middle to both sides of the first arc-shaped segment 331, the width of the second arc-shaped segment 332 gradually increases from a middle to both sides of the second arc-shaped segment 332, and the width of the arc-shaped connecting portion 333 gradually increases from a middle to both sides of the arc-shaped connecting portion 333.

With such arrangement, when the self-adaptive region 33 is bent, a middle position of the first arc-shaped segment 331, a middle position of the second arc-shaped segment 332, and a middle position of the arc-shaped connecting portion 333 are regions with the weakest stress, and are easiest to bend and deform, thereby ensuring that the deformable sheet can form three arc-shaped segments and fit the face.

In some embodiments, the first arc-shaped segment 331, the second arc-shaped segment 332, and the arc-shaped connecting portion 333 each defines a through-hole, and the number of through-holes may be one or more. Similarly, through-holes are defined in the first arc-shaped segment 331, the second arc-shaped segment 332, and the arc-shaped connecting portion 333, such that the stress of the self-adaptive 33 become weaker, which facilitates the deformation.

In at least one embodiment, as illustrated in FIG. 7 , a plurality of through-holes are provided, cross-section areas of the through-holes of the first arc-shaped segment 331 gradually decrease from a middle to both sides of the first arc-shaped segment 331, cross-section areas of the through-holes of the second arc-shaped segment 332 gradually decrease from a middle to both sides of the second arc-shaped segment 332, and cross-section areas of the through-holes (not illustrated) of the arc-shaped connecting portion 333 gradually decrease from a middle to both sides of the arc-shaped connecting portion 333. Therefore, middle portions of the first arc-shaped segment 331, the second arc-shaped segment 332, and the arc-shaped connecting portion 333 have the weakest stress, and are more prone to deformation.

In some embodiments, a material of the self-adaptive member 3 may also be a temperature change material, and the hardness of the self-adaptive member 3 changes with changing temperature. When the self-adaptive member 3 comes into contact with the user's face, the temperature rises, and the hardness of the self-adaptive member 3 decreases and is more prone to deformation, thereby realizing a better fit with the face. In at least one embodiment, the temperature change material may be made of one or more of polynorbornene, trans-polyisoprene, polyurethane, styrene-butadiene copolymer, polyolefin, polycaprolactone, and polyamide.

In some embodiments, the length adjustment member 2 is an adjustment belt, and the material of the adjustment belt is an elastic material or a flexible material. The elastic material, such as an elastic belt, can play a good adjustment effect. Just pull both ends of the elastic belt towards two sides, and then make it restore to an original position, such that the distance between the first self-adaptive region 33 and the second self-adaptive region 33 can be shortened to deform it. The flexible material, such as an ordinary lace, can also realize an adjustment effect.

In some embodiments, the self-adaptive member 3 can also be made into a sleeve structure, the length adjustment member 2 can pass through the sleeve to exert a deforming force on the self-adaptive member 3, and the length adjustment member 2 can also be connected to an end of the sleeve to exert a tension force on the sleeve to deform and adapt to the structure of the face. The thickness of sleeve at the self-adaptive region 33 is slightly thinner than the other parts, so as to realize deformation by force for adaption to the structure of the face.

In some embodiments, the material of the length adjustment member 2 is aluminum, such as a commonly used aluminum nose bridge strip structure, which plays a certain role in maintaining the shape after the length adjustment member 2 is bent. The length adjustment member 2 continuously exerts force on the self-adaptive region 33, which can prevent it from deforming due to facial movement. The length adjustment member 2 uses an aluminum strip structure, and a limiting structure should be arranged between the length adjustment member 2 and the self-adaptive member 3 to ensure that when the length of the length adjustment member 2 between the self-adaptive regions reaches an appropriate position, the position of the length adjustment member 2 can be limited. For example, opposite side faces of the length adjustment member 2 and the self-adaptive member 3 are provided with matching helical teeth, and the helical teeth of the length adjustment member 2 and the helical teeth of the self-adaptive member 3 are inclined in opposite directions. With such arrangement, the self-adaptive member 3 can only move in one direction relative to the length adjustment member 2. When the self-adaptive members 3 has a trend to move in the other direction, the helical teeth of the self-adaptive member 3 is matched with the helical teeth of the length adjustment member 2, and the self-adaptive member 3 cannot continue to move, to realize the limiting function.

In some embodiments, the self-adaptive member 3 is a deformable sheet, and the deformable sheet may be a thin sheet that can deform by force such as a plastic sheet, an aluminum sheet or the like. The deformable sheet may be an independent structure arranged between the body 1 and the length adjustment member 2, or may be directly used as the upper edge of the body 1.

Compared with a flexible structure of an upper edge of an ordinary mask body 1, the deformable sheet not only can deform better and fit the face adaptively, but also can be difficult to be deformed when the user exhales due to its certain hardness, such that the mask has a better protection effect. After the mask is used, the deformable sheet can also automatically restore to the flat and strength state, occupying less space.

As illustrated in FIGS. 4 and 5 , in some embodiments, the self-adaptive region 33 defines a first middle hole 43 and a second middle hole 44, the first self-adaptive fixing region 31 defines a first left hole 41 and a second left hole 42, the second self-adaptive fixing region 32 defines a first right hole 45 and a second right hole 46, and the adjustment belt pass through the first left hole 41, the second left hole 42, the first middle hole 43, the second middle hole 44, the first right hole 45, and the second right hole 46 sequentially. It should be noted that a through-hole is also provided between the first middle hole 43 and the second middle hole 44 to reduce the stress of the self-adaptive region 33 at this position.

Therefore, the adjustment belt passes through the above holes sequentially, and the adjustment belt extends along a length direction of the deformable sheet (a left-right direction shown by arrow A in FIG. 4 ). The deformable sheet can slide along the adjustment belt. A dual through-hole structure increases friction between the adjustment belt and the deformable sheet. The adjustment belt not only plays a role in connecting, but also plays a role in fixing. After the deformable sheet is deformed, the adjustment belt can prevent both ends of the deformable sheet from extending outward to a certain extent, and maintain it in the second position.

As illustrated in FIGS. 5 and 6 , in some embodiments, the deformable sheet has a central protruding portion 48, a left middle protruding portion 47, and a right middle protruding portion 49 that protrude downward. The central protruding portion 48 protrudes downward and is located at a center of the deformable sheet. The left middle protruding portion 47 protrudes downward, and is located at a left side of the central middle protruding portion 48 and spaced apart from the central protruding portion 48. The right middle protruding portion 49 protrudes downward, and is located at a right side of the central protruding portion 48 and spaced apart from the central protruding portion 48.

In some embodiments, in order to adapt to different widths of nose bridges of different faces and realize a good fit with different faces, edges of two sides of the left middle protruding portion 47 and the right middle protruding portion 49 are provided with creases, the users can selectively break a crease line of the edges of the protruding portions according to the width of their own nose bridge to realize a better fit.

In at least one embodiment, the central protruding portion 48 is substantially rectangular, each of the left middle protruding portion 47 and the right middle protruding portion 49 gradually becomes narrower from top to bottom and has an arc-shaped lower edge. The width of the deformable sheet in the up-down direction gradually increases from the left middle protruding portion 47 towards a left end of the deformable sheet and gradually increases from the right middle protruding portion 49 towards a right end of the deformable sheet.

During production, a symmetrical design of the deformable sheet makes the shape of the deformable sheet aesthetic. The lower edge of the deformable sheet gradually decreases and has a certain curvature from the left middle protruding portion 47 and the right middle protruding portion 49 to the central protruding portion 48, the purpose of which is to reduce the material near the cheekbone, and reduce the pressure of the deformable sheet on the cheekbone. At the same time due to the curved design, the deformable sheet can be snugly fitted with the face, and the sealing of the mask can be enhanced. However, the width of the deformable sheet in the up-down direction gradually increases from the left middle protruding portion 47 towards the left end of the deformable sheet and gradually increases from the right middle protruding portion 49 towards the right end of the deformable sheet, which is to strengthen the overall strength of the deformable sheet. At the same time, widths of the elastic nose clips in the up-down direction are thickened at two sides of the body 1 where gaps are likely to occur, to prevent gaps from occurring at the two sides of the body 1 and enhance the sealing performance of the mask.

The mask according to some embodiments of the present disclosure will be described below with reference to drawings.

As illustrated in FIG. 1 , the mask according to embodiments of the present disclosure includes a body 1 having an upper edge and a lower edge. The upper edge of the body 1 is provided with a length adjustment member 2 and a self-adaptive member 3 arranged at an inner side of the length adjustment member 2. In this embodiment, the length adjustment member 2 is an adjustment belt, and the self-adaptive member 3 is a deformable sheet.

As illustrated in FIGS. 2 and 3 , the deformable sheet includes a first self-adaptive fixing region 31, a second self-adaptive fixing region 32, and a self-adaptive region 33. The self-adaptive region 33 can be bent to change between a first position and a second position. In the first position, the deformable sheet is flat and straight, and the whole body 1 is a flat state. In the second position, the adjustment belt drives the upper edge of the body 1 to bend, a linear distance between the first self-adaptive fixing region 31 and the second self-adaptive fixing region 32 is reduced, and the self-adaptive region 33 is bent. The self-adaptive region 33 is substantially W-shaped and includes a first arc-shaped segment 331, a second arc-shaped segment 332, and an arc-shaped connecting portion 333, the arc-shaped connecting portion 333 is located between the first arc-shaped segment 331 and the second arc-shaped segment 332 and functions as a connection, both the first arc-shaped segment 331 and the second arc-shaped segment 332 protrude towards an inner side of the body 1, and the arc-shaped connecting portion 333 protrudes towards an outer side of the body 1.

In the second position, the arc-shaped connecting portion 333 is fitted with a nose bridge of a user, the first arc-shaped segment 331 and the second arc-shaped segment 332 are fitted with the face on both sides of the nose bridge, and the shape of the deformable sheet can be adjusted adaptively according to the adjustment belt.

A thickness of the self-adaptive region 33 is less than a thickness of the first self-adaptive fixing region 31, and the thickness of the self-adaptive region 33 is less than a thickness of the second self-adaptive fixing region 32. Furthermore, the thickness of the first arc-shaped segment 331 gradually increases from a middle to both sides of the first arc-shaped segment 331, the thickness of the second arc-shaped segment 332 gradually increases from a middle to both sides of the second arc-shaped segment 332, and the thickness of the arc-shaped connecting portion 333 gradually increases from a middle to both sides of the arc-shaped connecting portion 333.

As illustrated in FIG. 5 , the self-adaptive region 33 defines a first middle hole 43 and a second middle hole 44, the first self-adaptive fixing region 31 defines a first left hole 41 and a second left hole 42, and the second self-adaptive fixing region 32 defines a first right hole 45 and a second right hole 46. The adjustment belt passes sequentially through the first left hole 41, the second left hole 42, the first middle hole 43, the second middle hole 44, the first right hole 45, and the second right hole 46. After the deformable sheet is deformed, the adjustment belt can prevent both ends of the deformable sheet from extending outward to a certain extent and maintain it in the second position.

The deformable sheet has a central protruding portion 48, a left middle protruding portion 47, and a right middle protruding portion 49 that protrude downward. The central protruding portion 48 protrudes downward and is located at a center of the deformable sheet. The left middle protruding portion 47 protrudes downward, and is located at a left side of the central protruding portion 48 and spaced apart from the central protruding portion 48. The right middle protruding portion 48 protrudes downward, and is located at a right side of the central protruding portion 48 and spaced apart from the central protruding portion 48.

In at least one embodiment, the central protruding portion 48 is substantially rectangular, each of the left middle protruding portion 47 and the right middle protruding portion 49 gradually becomes narrower from top to bottom and has an arc-shaped lower edge. A width of the deformable sheet in an up-down direction gradually increases from the left middle protruding portion 47 towards a left end of the deformable sheet and gradually increases from the right middle protruding portion 49 towards a right end of the deformable sheet.

In the description of the present disclosure, relative terms such as “central,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” “circumferential” and the like should be constructed to refer to the orientation or position as then described or as shown in the drawings under discussion. These relative terms are for convenience and simplification of description and do not indicate or imply that the device or element referred to must have a particular orientation, or be constructed and operated in a particular orientation, so these terms shall not be construed to limit the present disclosure.

In the description of the present disclosure, terms “first,” “second,” should be constructed for purposes of illustration only and should not be constructed to indicate or imply relative importance or indicate or imply the number of technical features. Therefore, defining the features of “first,” “second,” that may explicitly or implicitly include one or more of the features. In the descriptions of the present disclosure, “a plurality of” means two or more than two unless specified or limited otherwise.

In the present disclosure, unless specified or limited otherwise, the terms “mounted,” “connected,” “coupled,” and “fixed” and variations thereof should be understood broadly. For example, these may be permanent connections, detachable connections or integrated; mechanical connections, electrical connections or communicated with each other; direct connections or indirect connections through intermediaries; intercommunication or interaction relationships of two elements, unless specified or limited otherwise. Those skilled in the related art may understand specific meanings of the above terms in the present disclosure according to specific situations.

In the present disclosure, unless specified or limited otherwise, a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature is in indirect contact with the second feature through intermediaries. Furthermore, a first feature “on,” “above,” or “on top of” a second feature may include an embodiment in which the first feature is right “on,” “above,” or “on top of” the second feature, and may also include an embodiment in which the first feature is diagonally “on,” “above,” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature. A first feature “beneath,” “below,” or “on bottom of” a second feature may include an embodiment in which the first feature is right “beneath,” “below,” or “on bottom of” the second feature, and may also include an embodiment in which the first feature is diagonally “beneath,” “below,” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.

In the present disclosure, reference throughout this specification to “an embodiment,” “some embodiments,” “an example,” “a specific example,” or “some examples,” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases such as “in some embodiments,” “in one embodiment”, “in an example,” “in a specific example,” or “in some examples,” in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the related art may combine and incorporate different embodiments or examples and their features described in the specification, without mutual contradictions.

Although explanatory embodiments have been illustrated and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure. 

1. A mask, comprising: a body having an upper edge; a length adjustment member provided at the upper edge of the body; and a self-adaptive member provided at the upper edge of the body and arranged at an inner side of the length adjustment member, wherein the length adjustment member is bendable along a curve of a face and is able to act on the self-adaptive member, so that the self-adaptive member is deformed by force and adapted to the curve of the face to fit on the face.
 2. The mask according to claim 1, wherein the self-adaptive member comprises a first self-adaptive fixing region, a second self-adaptive fixing region, and a self-adaptive region located between the first self-adaptive fixing region and the second self-adaptive fixing region, the length adjustment member is used to adjust a distance between the first self-adaptive fixing region and the second self-adaptive fixing region, so that the self-adaptive region forms an arc shape suitable for the face.
 3. The mask according to claim 2, wherein the self-adaptive region is bendable to change between a first position where the self-adaptive region is flat and straight, and a second position where the self-adaptive region is substantially W-shaped and comprises a first arc-shaped segment, a second arc-shaped segment, and an arc-shaped connecting portion connecting the first arc-shaped segment and the second arc-shaped segment, both the first arc-shaped segment and the second arc-shaped segment protrude towards an inner side of the body, the arc-shaped connecting portion protrudes towards an outer side of the body.
 4. The mask according to claim 2, wherein a thickness of the self-adaptive region is less than a thickness of the first self-adaptive fixing region, and the thickness of the self-adaptive region is less than a thickness of the second self-adaptive fixing region.
 5. The mask according to claim 3, wherein a thickness of the first arc-shaped segment gradually increases from a middle to both sides of the first arc-shaped segment, a thickness of the second arc-shaped segment gradually increases from a middle to both sides of the second arc-shaped segment, and a thickness of the arc-shaped connecting portion gradually increases from a middle to both sides of the arc-shaped connecting portion.
 6. The mask according to claim 2, wherein a width of the self-adaptive region is less than a width of the first self-adaptive fixing region, and the width of the self-adaptive region is less than a width of the second self-adaptive fixing region.
 7. The mask according to claim 3, wherein a width of the first arc-shaped segment gradually increases from a middle to both sides of the first arc-shaped segment, a width of the second arc-shaped segment gradually increases from a middle to both sides of the second arc-shaped segment, and a width of the arc-shaped connecting portion gradually increases from a middle to both sides of the arc-shaped connecting portion.
 8. The mask according to claim 3, wherein the first arc-shaped segment, the second arc-shaped segment and the arc-shaped connecting portion each define a through-hole.
 9. The mask according to claim 8, wherein cross-section areas of the through-holes of the first arc-shaped segment gradually decrease from a middle to both sides of the first arc-shaped segment, cross-section areas of the through-holes of the second arc-shaped segment gradually decrease from a middle to both sides of the second arc-shaped segment, and cross-section areas of the through-holes of the arc-shaped connecting portion gradually decrease from a middle to both sides of the arc-shaped connecting portion.
 10. The mask according to claim 1, wherein a material of the self-adaptive member is a temperature change material.
 11. The mask according to claim 1, wherein the length adjustment member is an adjustment belt or a sleeve, a material of the adjustment belt or the sleeve is an elastic material, or the material of the adjustment belt or the sleeve is flexible material.
 12. The mask according to claim 1, wherein the self-adaptive member is a deformable sheet.
 13. The mask according to claim 3, wherein the arc-shaped connecting portion defines a first middle hole and a second middle hole, the first self-adaptive fixing region defines a first left hole and a second left hole, the second self-adaptive fixing region defines a first right hole and a second right hole, the length adjustment member passes sequentially through the first left hole, the second left hole, the first middle hole, the second middle hole, the first right hole, and the second right hole.
 14. The mask according to claim 12, wherein the deformable sheet has a central protruding portion, a left middle protruding portion, and a right middle protruding portion that protrude downward, the central protruding portion protrudes downward and is located at a center of the deformable sheet; the left middle protruding portion protrudes downward, and is located at a left side of the central protruding portion and spaced apart from the central protruding portion; and the right middle protruding portion protrudes downward, and is located at a right side of the central protruding portion and spaced apart from the central protruding portion.
 15. The mask according to claim 14, wherein the central protruding portion is substantially rectangular, each of the left middle protruding portion and the right middle protruding portion gradually becomes narrower from top to bottom and has an arc-shaped lower edge.
 16. The mask according to claim 14, wherein a width of the deformable sheet in an up-down direction gradually increases from the left middle protruding portion towards a left end of the deformable sheet and gradually increases from the right middle protruding portion towards a right end of the deformable sheet.
 17. The mask according to claim 10, wherein the temperature change material is made of one or more of polynorbornene, trans-polyisoprene, polyurethane, styrene-butadiene copolymer, polyolefin, polycaprolactone, and polyamide.
 18. The mask according to claim 1, wherein a material of the length adjustment member comprises aluminum.
 19. The mask according to claim 12, wherein the deformable sheet is an independent structure arranged between the body and the length adjustment member.
 20. The mask according to claim 12, wherein the deformable sheet is directly used as the upper edge of the body. 